package ch9;

/**
 * Created by lyk on 2016/10/24.
 * Package name: ch9
 * Porject name: untitled1
 */

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * @version 1.33 2007-06-12
 * @author Cay Horstmann
 */
public class DialogTest
{
    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                DialogFrame frame = new DialogFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

/**
 * A frame with a menu whose File->About action shows a dialog.
 */
class DialogFrame extends JFrame
{
    public DialogFrame()
    {
        setTitle("DialogTest");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        // construct a File menu

        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);
        JMenu fileMenu = new JMenu("File");
        menuBar.add(fileMenu);

        // add About and Exit menu items

        // The About item shows the About dialog

        JMenuItem aboutItem = new JMenuItem("About");
        aboutItem.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent event)
            {
                if (dialog == null) // first time
                    dialog = new AboutDialog(DialogFrame.this);
                dialog.setVisible(true); // pop up dialog
            }
        });
        fileMenu.add(aboutItem);

        // The Exit item exits the program

        JMenuItem exitItem = new JMenuItem("Exit");
        exitItem.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent event)
            {
                System.exit(0);
            }
        });
        fileMenu.add(exitItem);
    }

    public static final int DEFAULT_WIDTH = 300;
    public static final int DEFAULT_HEIGHT = 200;

    private AboutDialog dialog;
}

/**
 * A sample modal dialog that displays a message and waits for the user to click the Ok button.
 */
class AboutDialog extends JDialog
{
    public AboutDialog(JFrame owner)
    {
        super(owner, "About DialogTest", true);

        // add HTML label to center

        add(
                new JLabel(
                        "<html><h1><i>Core Java</i></h1><hr>By Cay Horstmann and Gary Cornell</html>"),
                BorderLayout.CENTER);

        // Ok button closes the dialog

        JButton ok = new JButton("Ok");
        ok.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent event)
            {
                setVisible(false);
            }
        });

        // add Ok button to southern border

        JPanel panel = new JPanel();
        panel.add(ok);
        add(panel, BorderLayout.SOUTH);

        setSize(250, 150);
    }
}
